Adhesive compound.



JOHN EVERSHED, OF KENLEY, ENGLAND.

ADHESIVE COMPOUND.

SPECIFICATION forming part Of Letters Patent NO. 629,006, dated. July 18, 1899 Application filed May 10, 1899. Serial No. 716,305. (No specimens.)

T0 (tZZ whom, it may concern.-

Be it known that I, JOHN EVERSHED, manufacturing chemist, a subject of the Queen of Great Britain, residing at Kenley, in the county of Surrey, England, have invented a new and useful Adhesive, of which the following is a specification.

My invention relates to the manufacture of a new adhesive material or gum which is applicable to most of the purposes for which various gums and adhesive substances are used and possessing advantages, inasmuch as it is capable of being made particularly clear and bright, is odorless, not liable to spontaneous fermentation, and is non-hygroscopic, and can be produced at a relatively low price. It is therefore greatly superior to some of the adhesives heretofore in general use.

I have discovered that a viscous product is formed when one of the groups of carbohydrates known as sugar is acted upon by boracic acid and an alkaline earth. According to my invention I employ one of the wellknown carbohydrates of the sugar groupsuch as glucose, maltose, sucrose, levulose, invert sugar, treacle, molasses, beet-sugar, or cane-sugar. In actual practice I find it most advantageous to use glucose with boracic acid, and of the alkalies or alkaline earth I prefer to use calcined magnesia in about the following proportions: glucose, one hundred and twelve (112) pounds; boracic acid, forty to fifty (40 to 50) pounds; calcined magnesia, thirty to forty (30 to 40) pounds. I dissolve the glucose in four gallons of water, for that purpose raising the temperature to about centigrade, and run the solution into, preferably, a wooden mixing-vat. I then add the boracic acid and calcined magnesia, both in the state of powder, in small quantities alternately, so that there may not, at any time be too great an excess of either of them, stirring all the time untiltheyarethoroughlyincorporated. During the operation the temperature rises and care must be exercised not to allow it to rise above 90 centigrade, as any increase of temperature above this would damage the color of the product. To prevent such undue rise of temperature, I find it sufficient to add the materials slowly, and in case of necessity cold water or ice may be added. The use of metallic vessels and implements is to be avoided on account of the chemical action between a metallic surface and the mixture.

pounds of calcined magnesia, and sufficient water added to reduce the density to about 60 Twaddle. The proportions may be varied within wide limits, according to the nature and quality of the saccharine matter and of the alkali used and according to the qualities required in the product. As an example of an equivalent alkaline earth I mention lime.

I am aware that heretofore it has been proposed to use sugars, such as glucose and grapesugar, in connection with boracic acid and a soluble alkalisuch as caustic-soda lye, ammonia, alum, and soda-to make a mu'cilage; but mucilage so made is of inferior cementing power, is quite hygroscopic, and is a slow drier. The novelty of my invention consistsin the employment of analkaline cined magnesia, substantially as set forth.

2. An adhesive compound resulting from the mixture of one of the carbohydrates known as sugars, boracic acid, and calcined magnesia, substantially as set forth.

3. An adhesive compound resulting from the mixture of glucose, boracic acid, and an alkaline earth, substantially as set forth.

4. An adhesive compound resulting from the mixture of one of the carbohydrates known as sugars, boracic acid, and an alkaline earth,

substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

JOHN EVERSHED.

WVitnesses: I

NEWELHAM BROWNE, WILMER M. HARRIs. 

